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  1. P

    Diffrential Protection Relay

    Ali... can you provide a Single-Line-Diagram (SLD) or a hand-drawn sketch of your system arrangement? Send it to [email protected] Regards, Phil Corso
  2. P

    Physics of ... Tap-Changer

    CSA, I could have said adjust, maintain or regulate. More importantly, you are correct... the math must be completed before Part 2 is made known. I know you will be surprised about what it reveals. Regards, Phil
  3. P

    Generator Synchronization Power Swings

    Kevin... If left to its own devices (excuse the pun) do the swings worsen, or lessen? Phil
  4. P

    Physics of ... Tap-Changer

    Sorry RootBoy, Not even a "plastc-ring"! Regards, Phil
  5. P

    Physics of ... Tap-Changer

    Hmmm... no 'takers'!
  6. P

    Generator Synchronization Power Swings

    Kevin... Actually it was "Marmaduke", a character out of <i>Power Magazine</i>. Phil
  7. P

    Generator Synchronization Power Swings

    Kevin... Hogwash (I'm beginning to sound like Chief Hornblower) on computer simulation. Can you operate an Oscilloscope? Phil
  8. P

    Generator Synchronization Power Swings

    Bruce, I agree. It is the reason I sugggested "return to basics"! Regards, Phil
  9. P

    (I2)^2t Protection for Induction Motors

    Amritanshup... If the "Motor" is a Critical Asset to your operation then use of a Neg-Seq relay is warranted as the simplest approach. Setting the relay will be identical to that of a generator app. The trick is to get an IsqT "value" from the motor manufacturer. If the manufacturer is...
  10. P

    Generator Synchronization Power Swings

    Kevin, CSA... Contact me at [email protected]. But be advised that I don't respond to anonymity. Regards, Phil
  11. P

    Generator Synchronization Power Swings

    Kevin... What are the exact delta-speed, delta-voltage, and time-aperture, parameters, set into your synchro-scope? Phil Corso ([email protected])
  12. P

    Power factor

    Fresher, the Power factor of your generator is based on its output parameters, that is MW, and MVAr. If those two values are known, then, PF = MW/SQRT(MW^2+MVAr^2) Regards, Phil Corso ([email protected])
  13. P

    Calculating the Efficiency of an Induction Motor

    Pravin... have you searched Control.Com Archives? Regards, Phil Corso ([email protected])
  14. P

    Generator Synchronization Power Swings

    Kevin... you may have to go back to basics! Have you calculated the magnitude of Synchronizing-power and Damping-Torque?
  15. P

    Generator Synchronization Power Swings

    Kevin... do you get the swings if synchronizing is done manually? Regards, Phil Corso ([email protected])
  16. P

    Physics of ... Tap-Changer

    Correction: &#8736;&#952;rº of Exercise 2 should be 0.00
  17. P

    Supplying Generator Rotor Using Carbon Brushes

    CSA... are you sure you don't mean Brushless Excitation systems are used for very large alternators, and Slip-Ring excitation (Brush-type) are limited to smaller machines? Phil
  18. P

    Calculating Motor Specifications To Run a Conveyor

    Pumooy... I have a Nomogram that you can have. Regards, Phil Corso ([email protected])
  19. P

    Physics of ... Tap-Changer

    A number of forum threads discuss how the step-up transformer connecting an Alternator to the Grid is able to control voltage-alignment using a Tap-Changer. Also discussed is the question, "What happens when tap-position is altered?" Thus far, in my opinion, there has not been a viable...
  20. P

    SCR Heating Control

    Condern1... some Xfmr-related questions: 1) Is Primary-winding (480Vac, Controller-side) Delta-connected? 2) Is Secondary-winding (107Vac, Heater-side) Wye-Connected? 3) Is Heater 3-wire or 4-wire connected? 4) Is Xfmr showing any sign of distress, i.e, Temperature, or humming sound...
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